TWI840157B - Cold rolling improved process of product having uncut laser welding bead - Google Patents

Abstract

The present disclosure provides a cold rolling improved process of a product having an uncut laser welding bead. In the cold rolling improved process, first adjusting a maximum concave depth of the product. The maximum concave depth is from 0 cm to 9 cm, excluding the endpoint valve. Then, adjusting a tension setting valve of a rolling mill when the concaved laser welding bead is passed through the rolling mill. An adjustment range of the tension setting valve is 80% to 150%. In this way, the component force is reduced to effectively reduce the generation of cracks.

Description

Improved cold rolling process for products with non-trimmed laser welding lines

The present disclosure relates to an improved cold rolling process, and more particularly to an improved cold rolling process for a product having a non-trimmed laser welding path.

Please refer to FIG. 1, which shows a schematic top view of the existing product 100 where the end portions 120 on both sides of the laser weld 110 are to be cut off. Since the end portions 120 on both sides of the laser weld 110 are relatively weak, the end portions 120 on both sides of the laser weld 110 in the product 100 are first cut off during the cold rolling process. During the cold rolling process, since the end portions 120 on both sides of the laser weld 110 with relatively weak strength have been cut off, the laser weld 110 of the product 100 is not easy to crack, thereby reducing the occurrence of a broken strip.

Next, refer to FIG. 2A, which shows a top plan view schematic diagram of another existing product 200 where the ends 220 on both sides of the laser weld 210 are to be recessed. Due to material characteristics or process characteristics, some products 200 are not suitable for cutting off the ends 220 on both sides of the laser weld 210 with weaker strength, so a recessing machine is used to remove the ends 220 on both sides of the laser weld 210, wherein the maximum recessing depth D1 is 9 cm or 15 cm. Next, refer to FIG. 2B, which shows a top plan view schematic diagram of the product 200 of FIG. 2A subjected to tension T1 after recessing. When the product 200 is subjected to tension T1 during the cold rolling process, the concave arc section 230 formed at the recess of the product 200 will form a radially distributed component force F1, which is prone to cracks or even broken bands, so it is urgently needed to be improved.

Therefore, one object of the present disclosure is to provide an improved cold rolling process for a product with a non-trimmed laser welded track, thereby improving the crack and break conditions.

According to the above-mentioned purpose of the present disclosure, an improved cold rolling process for a product with a non-trimmed laser weld is proposed. The improved cold rolling process for a product with a non-trimmed laser weld includes using a notching machine to notch the end of the laser weld of the product, and cooperating with a sensing switch and a control unit to adjust the maximum notching depth of the product. The maximum notching depth is greater than 0 cm and less than 9 cm, excluding the end point value. Then, the tension setting value provided by the rolling machine when the laser weld passes after notching is adjusted. The adjustment range of the tension setting value is 80% to 150%.

According to one embodiment of the present disclosure, the maximum recessed depth of the recessed product is greater than 2 cm and less than 8 cm, including the end point values.

According to one embodiment of the present disclosure, the tension setting value of the calender is adjusted by adjusting the conveying speed of the product to the calender at a low speed.

According to one embodiment of the present disclosure, the speed range of the low speed section is 100 mpm to 200 mpm.

According to one embodiment of the present disclosure, the sensing switch is a photoelectric switch.

According to one embodiment of the present disclosure, the material of the above-mentioned product is steel.

According to an embodiment of the present disclosure, the material of the above-mentioned product is high silicon content electromagnetic steel.

According to one embodiment of the present disclosure, the above-mentioned notching machine is used to notch the end of the laser welding track of the product and form a concave arc segment.

According to one embodiment of the present disclosure, the distance from the lowest point of the concave arc section to the adjacent side edge of the product is the maximum concave depth.

According to one embodiment of the present disclosure, the low point of the concave arc section is located at the laser welding track.

As can be seen from the above, the present disclosure adjusts the maximum recess depth at the end of the laser welding track of the product and adjusts the tension setting value to reduce the force component, thereby reducing the generation of cracks. Therefore, the present disclosure can effectively reduce the probability of broken strips and increase the output rate of products, thereby achieving the purpose of reducing waste and reducing costs.

Please refer to FIG. 3A and FIG. 3B, wherein FIG. 3A is a schematic top view of the two side ends 311 of a product 300 of one embodiment of the present disclosure, where a laser weld 310 is to be recessed. FIG. 3B is a schematic top view of the product 300 of FIG. 3A subjected to a tension T2 after recessing. The improved cold rolling process disclosed herein is applicable to a product 300 having a non-trimmed laser weld 310. The material of the product 300 may be steel, and may further be high silicon content electromagnetic steel. The tail end of the first steel strip 320 in the product 300 and the head end of the second steel strip 330 in the product 300 are laser welded, and a laser weld 310 is formed at the weld.

The improved cold rolling process includes using a notching machine to notch the end 311 of the laser weld 310 of the product 300, and cooperating with one or more sensing switches and control units to adjust the maximum notching depth D2 of the notching of the product 300. The maximum notching depth D2 is greater than 0 cm and less than 9 cm, excluding the end point value. In one example, the notching machine notches the ends 311 on both sides of the laser weld 310 of the product 300, and the two sides of the product 300 form a symmetrical maximum notching depth D2. That is, the maximum notching depth D2 formed on both sides of the product 300 is the same. In other words, when the maximum notching depth D2 formed on the left side of the product 300 is 5 cm, the maximum notching depth D2 formed on the right side of the product 300 is also 5 cm.

In one example, the sensing switch can be a photoelectric switch. In one example, when the production line is transported at a constant speed, the purpose of adjusting the maximum recess depth D2 can be achieved by using the recessing machine in conjunction with the sensing switch and the control unit. That is, after the sensing switch senses the laser channel 310 of the product 300, the control unit controls the recessing machine to recess the end 311 of the laser channel 310 of the product 300 after a certain number of seconds. In other words, by using the sensing switch in conjunction with the control unit, the recessing machine can adjust the recessing degree of the product 300 in a manner that calculates the distance in seconds to obtain an appropriate maximum recess depth D2.

In one example, the maximum recess depth D2 may be greater than 2 cm and less than 8 cm, including the end value. Among them, the maximum recess depth D2 is greater than 2 cm, which can improve the control stability of the maximum recess depth D2. In one example, the end 311 of the laser weld 310 of the product 300 is recessed by a recessing machine to form a concave arc section 340 on the product 300. The concave arc section 340 extends to the adjacent side edge 350 in the product 300, and the concave arc section 340 is connected to the laser weld 310. In one example, the distance from the low concave point P of the concave arc section 340 to the adjacent side edge 350 in the product 300 is the maximum recess depth D2. In one example, the low concave point P of the concave arc section 340 is located at the laser weld 310.

As shown in FIG3B , by reducing the maximum recessed depth D2 of the product 300, the range of the recessed portion of the product 300 is reduced, that is, the range of the concave arc section 340 of the product 300 is reduced. In other words, reducing the maximum recessed depth D2 of the product 300 will also reduce the length of the concave arc section 340 of the product 300. Therefore, the radially distributed component force F2 formed at the concave arc section 340 can be effectively reduced, thereby reducing the probability of cracks in the concave arc section 340.

Please refer to FIG. 4, which is a side view schematic diagram of the product 300 of FIG. 3B entering the calender 400 for rolling. The product 300 after the groove is then entered into the calender 400. Before the laser weld 310 enters the calender 400, the conveying speed of the product 300 is adjusted to adjust the tension T2 setting value provided by the calender 400 when the laser weld 310 after the groove passes through. In some embodiments, the conveying speed of the product 300 falls within the speed range of the low speed section of the calender 400. For example, the speed range of the low speed section is 100 meters per minute (mpm) to 200 meters per minute (mpm). The adjustment range of the tension T2 setting value can be 80% to 150%. The inventors found that the maximum recessed depth D2 of the product 300 can be reduced by adjusting the setting value of the tension T2 during the rolling delay to 120% to 200%, which can achieve the purpose of reducing cracks. The inventors further found that when the setting value of the tension T2 is adjusted within a range of 80% to 150%, the maximum recessed depth D2 of the product 300 can be reduced, which can further reduce the occurrence of cracks.

In the above, the tension T2 setting value of the rolling mill 400 can be adjusted according to the characteristics of the product 300. That is, the tension T2 setting value between each station of the rolling mill 400 is adjusted. The operator can appropriately adjust the tension T2 setting value within the allowable rolling force range based on the production experience of the production line. Under the control of not affecting the rolling thickness, the probability of cracks occurring at the concave part of the product 300 is reduced.

Please refer to FIG. 4 , the concave product 300 sequentially passes through the first station 410, the second station 420, the third station 430, the fourth station 440 and the fifth station 450 of the rolling machine 400. According to the characteristics of the product 300, the tension T2 setting value between the first station 410 and the second station 420, the tension T2 setting value between the second station 420 and the third station 430, the tension T2 setting value between the third station 430 and the fourth station 440 and the tension T2 setting value between the fourth station 440 and the fifth station 450 are adjusted. The adjustment range of the tension T2 setting value between the first station 410 and the second station 420 can be 80% to 150%. The adjustment range of the tension T2 setting value between the second station 420 and the third station 430 can be 80% to 150%. The adjustment range of the tension T2 setting value between the third station 430 and the fourth station 440 can be 80% to 150%. The adjustment range of the tension T2 setting value between the fourth station 440 and the fifth station 450 can be 80% to 150%.

In one example, the tension T2 setting values between the stations of the rolling mill 400 may be the same or different. In one example, the adjustment range of the tension T2 setting values between the stations of the rolling mill 400 may be the same or different. In one example, according to the characteristics of the product 300, the adjustment range of the tension T2 setting value between the first station 410 and the second station 420 may be smaller than the adjustment range of the tension T2 setting value between the second station 420 and the third station 430, the adjustment range of the tension T2 setting value between the second station 420 and the third station 430 may be smaller than the adjustment range of the tension T2 setting value between the third station 430 and the fourth station 440, and the adjustment range of the tension T2 setting value between the third station 430 and the fourth station 440 may be greater than the adjustment range of the tension T2 setting value between the fourth station 440 and the fifth station 450. The adjustment range of the tension T2 setting value between each station is adjusted according to the characteristics of the product 300, but is not limited thereto.

From the above implementation, it can be seen that one advantage of the present disclosure is that the present disclosure adjusts the maximum recess depth at the end of the laser welding track of the product and subsequently adjusts the tension setting value to reduce the force component, thereby reducing the occurrence of cracks. Therefore, the present disclosure can effectively reduce the probability of broken strips and increase the output rate of products, thereby achieving the purpose of reducing waste and reducing costs.

Although the present disclosure has been disclosed as above by way of embodiments, it is not intended to limit the present disclosure. Anyone with ordinary knowledge in this technical field may make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the definition of the attached patent application scope.

100,200,300: Product 110,210,310: Laser welding 120,220,311: End 230,340: Concave arc section 320: First steel strip 330: Second steel strip 350: Side edge 400: Rolling machine 410: First station 420: Second station 430: Third station 440: Fourth station 450: Fifth station D2: Maximum concave depth F1,F2: Force component P: Low concave point T1,T2: Tension

In order to make the above and other purposes, features, advantages and embodiments of the present disclosure more clearly understandable, the attached drawings are described as follows. FIG. 1 is a schematic diagram of a top view of the two side ends of the existing product to be cut off the laser weld. FIG. 2A is a schematic diagram of a top view of the two side ends of another existing product to be recessed in the laser weld. FIG. 2B is a schematic diagram of a top view of the product of FIG. 2A subjected to tension after recessing. FIG. 3A is a schematic diagram of a top view of the two side ends of a product to be recessed in the laser weld according to one embodiment of the present disclosure. FIG. 3B is a schematic diagram of a top view of the product of FIG. 3A subjected to tension after recessing. FIG. 4 is a schematic diagram of a side view of the product of FIG. 3B entering a rolling mill for rolling.

Domestic storage information (please note in the order of storage institution, date, and number) None Foreign storage information (please note in the order of storage country, institution, date, and number) None

300:Products

310: Laser Welding

320: First Steel Belt

330: Second steel belt

340: Concave arc section

350: Side edge

D2: Maximum recess depth

F2: Component force

P: Low pit

T2: Tension

Claims (9)

An improved cold rolling process for a product with a non-trimmed laser weld includes: using a groove opening machine to groove the two ends of a laser weld of a product, and cooperating with at least one sensing switch and a control unit to adjust a maximum groove opening depth of the product, wherein the maximum groove opening depth is greater than 0 cm and less than 9 cm, excluding the end point value; and adjusting at least one tension setting value provided by a rolling machine when the laser weld passes through after the groove opening, wherein an adjustment range of the at least one tension setting value is 80% to 150%. An improved cold rolling process for a product with a non-trimmed laser welded track as described in claim 1, wherein the maximum recess depth of the recessed product is greater than 2 cm and less than 8 cm, including the end point value. An improved cold rolling process for a product with a non-trimmed laser welded track as described in claim 1, wherein the at least one tension setting value of the rolling mill is adjusted by adjusting a conveying speed of the product to a low speed section of the rolling mill, and a speed range of the low speed section is 100 mpm to 200 mpm. An improved cold rolling process for a product having a non-trimmed laser welded track as described in claim 1, wherein each of the at least one sensing switch is a photoelectric switch. An improved cold rolling process for a product having a non-trimmed laser welded path as described in claim 1, wherein the material of the product is steel. An improved cold rolling process for a product having a non-trimmed laser welded track as described in claim 5, wherein the material of the product is high silicon content electromagnetic steel. The improved cold rolling process of the product with a non-trimmed laser weld as described in claim 1, wherein the concave machine is used to concave the two ends of the laser weld of the product and form two concave arc sections. The improved cold rolling process of a product with a non-trimmed laser welded channel as described in claim 7, wherein the distance from a low concave point of each of the two concave arc sections to an adjacent side edge of the product is the maximum concave depth. An improved cold rolling process for a product having a non-trimmed laser weld as described in claim 8, wherein the low point of each of the two concave arc sections is located at the laser weld.

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